Zoom lens system
Title：
Zoom lens system
Application Number：
 200510037127
Application Date：
 2005/09/07
Announcement Date：
 2007/03/14
Pub. Date：
Publication Number：
 1928611
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G02B 15/14G02B 9/10G02B 13/18G02B 5/20
Applicant(s)：
 Tsinghua University
Inventor(s)：
Key Words：
 Zoom lens, system
Abstract：
 The provided variable-focus lens system comprises: from the object to image, a first lens group with negative focal power, which includes a falcate first lens with concave toward the imaging plane and a second lens with positive optical power; and a second lends group with positive optical power, which includes an optical column, a biconvex third lens with positive optical power, and a negative-optical-power fourth lens with concave toward the object.
Claim：
Priority：
PCT：
LegalStatus：

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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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  Selected patents owned by Tsinghua University filed in 2006 and 2007 are load.







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